Geol. Also teschinite. [f. Teschen (see def.) + -ITE1 1 b.] A name given to certain eruptive rocks, occurring at Teschen in Austrian Silesia and elsewhere, intercalated and intrusive in the Cretaceous formation.
Used by different geologists with very varying extension.
1866. Lawrence, Cotta’s Rocks Class. (1878), 140. Teschinite is the name given … to a rock whose mass is chiefly felsitic, and in which hypersthene forms long black needles.
1888. Rutley, Rock-Forming Min., 115. A constant constituent of the rocks termed Teschenites.
